The second part of the question, for us in ID, is point 2): is a credible mechanism known that can explain the string? The answer for us is simple: it does not exist, because no real explicit and verifiable mechanism has been proposed for this string. So, we infer design.

Shorter gpuccio: 1. I believe something, that makes it a fact.2. We don't know how feature X evolved, that means it has been designed.